SpeedDigester K-425 / K-436 Technical data sheet On these two systems the heating level is adjusted using continuous controls. The optimized design of the heating chambers reliably ensures that all samples are homogeneously heated, an aspect that prevents the foaming of critical samples. With the K-436 the two heating chambers can be controlled individually.
Scope of delivery The SpeedDigester matches different and changing needs, and is available ready to be used with 300 ml, 500 ml or 250 ml 3 rd party sample tubes. The delivered rack and suction module type is depending on the sample tube size. For all configurations with 300 ml sample tubes three different suction module variants are available (standard, with condensate trap and for H 2 O 2 addition). The configuration only digester does not contain any accessory, and can be used for individual configurations like micro-kjeldahl, or reflux digestion (e.g. COD or aqua regia). The scope of delivery is not valid for the configuration only digester and depends on the ordered instrument configuration: K-425 K-436 Insulation plate 1 2 Hose set (EPDM) 1 1 Rack 1 2 Connecter to suction module 1 2 Suction module (incl. FKM seals) 1 2 Sample tubes (300 ml)* 8 12 Sample tubes (500 ml)* 5 10 Rubber plug for connecter to suction module - 1 * either 300 ml or 500 ml Order code Choose the configuration according to your needs: 1 1 5 0 0 Instrument model 425 SpeedDigester K-425 436 SpeedDigester K-436 Supply voltage 1 110 120 V ±10 50/60 Hz (only K-425) 2 220 240 V ±10 50/60 Hz SpeedDigester K-425 / K-436 configuraion 0 only digester (without any accessory for individual configuration e.g. reflux or micro) 1 300 ml sample tubes and standard suction module 2 300 ml sample tubes and suction module with condensate trap 3 300 ml sample tubes and suction module for H 2 O 2 addition 4 suction module for 250 ml 3 rd party sample tubes 5 500 ml sample tubes and suction module with condensate trap 2
Possible configurations and maximum number of samples Possible sample tube configurations Max. numbers of samples: K-425 K-436 100 ml tubes (micro-kjeldahl) 6 12 300 ml tubes (standard Kjeldahl) 6 12 500 ml tubes (TKN) 5 10 Ground joint tubes (NS 29/32; COD / reflux) 6 12 3 rd party tubes 6 12 Technical data K-425 K-436 Dimensions (WxHxD) 310 x 540 x 620 mm 310 x 540 x 620 mm Weight 12 kg 15.5 kg Operating voltage 110 120 V ±10 % / 220 240 V ±10 % 220 240 V ±10 % Frequency 50/60 Hz 50/60 Hz Power consumption 1280 W 2550 W Temperature range 70 580 C 70 580 C Degree of protection IP 20 IP 20 Approval CE / CSA CE / CSA Accessories For 300 ml tubes Suction module standard 1 11055849 1 Suction module with condensate trap 1 11055865 2 Suction module for H 2 O 2 addition 1 11055853 3 Sample tubes 300 ml For sample volumes up to 200 ml in volume or 5 g in weight 4 037377 4 Sample tubes (300 ml) 20 11059690 4 Rack for 300 ml/micro tubes 1 11055248 5 Insulation plate for 300 ml tubes 1 11055142 6 Bed-plate to rasing the sample tubes 1 11055943 7 Insulation cap for unused positions 1 11056024 25 3
For 500 ml tubes Suction module with condensate trap 1 11055851 8 Sample tubes (500 ml) 4 043982 9 Rack for 500 ml tubes (incl. base and interlock spring) 1 11056966 10 Insulation plate for 500 ml tubes 1 11055143 11 Insulation cap for unused positions 1 11056024 25 For micro-kjeldahl tubes Suction module standard 1 11055849 12 Sample tubes micro 4 11057442 13 Rack for 300 ml/micro tubes 1 11055248 14 Insulation plate for micro tubes 1 11055204 15 For reflux and COD digestion Reflux rack 1 11058226 16 Air reflux condenser 6 11058300 17 Water reflux setup 1 11058227 22 Absorption vessels for water reflux 6 11058377 23 Insulation plate (reflux) 1 11058218 18 Sample tubes ground joint (NS 29/32) 6 11058697 19 Stand for air reflux condensers 1 11058700 20 Cooling tray 1 11058701 21 Suction module standard 1 11055849 12 Connecter to suction module (PVDF; high resistant) 1 11056804 24 High resistant parts * Sealing (PTFE) 1 022442 Hose set (FKM) 1 11056891 Connecter to suction module (PVDF) 1 11056804 24 * For digestions using nitric acid, hydrochloric acid or aqua regia, special system requirements are necessary 4
General Accessories Glass caps For occupying empty sample positions, to close the suction circuit 4 040049 26 Stand with drip tray (for suction manifold) 1 11055216 17 Connection cable to Scrubber The Scrubber is controlled by the digester by the cable connection (already incl. at Scrubber ECO models) Digestion rods To prevent boiling delays 1 030973 10 043087 Scrubber K-415 1 see Data Sheet Scrubber Documentation Kjeldahl Guide (EN) Comprehensive guide covering all aspects of the theoretical and practical know-how Kjeldahl Practice Guide (EN) Provides theoretical background information, useful hints and calculation tables for daily routine work 1 11055033 1 11592548 Kjeldahl Practice Guide (DE) 1 11592547 Kjeldahl Practice Guide (CN) 1 11592549 IQ/OQ set cpl. for K-439 (EN) 1 11056167 IQ/OQ set cpl. for K-439 (DE) 1 11057207 Repeating OQ K-439 (EN) 1 11056253 Repeating OQ K-439 (DE) 1 11057209 Kjeldahl Tablets* Titanium 3.71 g (3.500 g K 2 SO 4, 0.105 g CuSO 4 5 H 2 O, 0.105 g TiO 2 ) 11057980 Missouri 5.00 g (4.980 g K 2 SO 4, 0.020 g CuSO 4 5 H 2 O) 11057982 ECO 4.00 g (3.998 g K 2 SO 4, 0.002 g CuSO 4 5 H 2 O) 11057983 Titanium Micro 1.59 g (1.500 g K 2 SO 4, 0.045 g CuSO 4 5 H 2 O, 0.045 g TiO 2 ) 11057981 Copper Micro 1.65 g (1.500 g K 2 SO 4, 0.150 g CuSO 4 5 H 2 O) 11057985 Antifoam 1.00 g (0.970 g Na 2 SO 4, 0.030 g Silicone Antifoam) 11057984 * Box of 1000 tablets 5
Accessories pictures For 300 ml tubes For 500 ml tubes For micro-kjeldahl tubes 3 2 1 8 12 4 9 13 5 10 14 6 11 15 7 For Reflux digestion For Reflux digestion COD Other accessories 23 17 21 17 22 19 24 25 16 16 19 20 26 18 18 6
Functional principle The infrared heating 1 generates high temperatures in the sample 2. The sample 2 is digested in the constantly boiling acid. Hot acid fumes rise into the condensation zone 3, condense and rinse back down to the sample creating a constant reflux. Residual fumes which escapes the condensation zone is highly corrosive and must be withdrawn and efficiently neutralized (i.e. with the Scrubber K-415) 4. Environmental air inlet dangerous vapors are drawn away Acid vapor outlet to suction unit (e.g. Scrubber) ( 5cm) Safety Zone Condensation Zone Insulation plate (fireclay insertion) Boiling / digesting sample Infrared heating www.buchi.com/kjeldahl Quality in your hands K-425 K-436 Data Sheet en 1306 C / Technical data are subject to change without notice / Quality Systems ISO 9001 The English version is the original language version and serves as basis for all translations into other languages.